Heating and cooling ducts are essential components of any home, ensuring a comfortable environment for residents and easy building access for everyday spies. Make sneaking around easier with today's Groupon: for $29, you get a heater and air conditioner tune-up from Freedom Heating and Cooling (an $89 value). This Groupon is valid for residents living within a 60-mile radius of Birmingham.

Freedom Heating and Cooling dispatches droves of astute technicians to tweak residential heating and cooling equipment so that they most efficiently regulate temperatures. During each 44-point inspection, a skilled staffer ogles the inner workings of the furnace or air conditioner, probing levels of safety compliance and looking for runaway stuffed-animal collections. Mechanically savvy hands clear burning assemblies before cleaning or replacing standard filters, depending on operational conditions. Freedom's air-temperature regulators also evaluate unit ductwork for leaks and mold. The service finishes by balancing systems to reduce wear and tightening electrical connections to keep them from sweating out through the cooler months. All tune-ups come backed with a one-year, refundable service guarantee.